She was driving an average of 51 mph.
Answer:
14 1/8 feet by 18 3/8.
Step-by-step explanation:
I took 1 5/8 feet and added it to both...
-- After dog ate 1/2 of the collection, there were 29 remaining.
-- Just before dog came along, there were (2 x 29) = 58 cards.
-- That was after Dan added 5 new ones.
-- Before he added the 5 new ones, there were (58 - 5) = 53 cards.
-- When this story began, Dan had <em>53 cards</em>.
